327
FNCA52 TJSJ 080730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST TUE SEP 8 2026
DISCUSSION
ELEVATED KBDI VALUES SIGNAL PERSISTENT DRY CONDITIONS IN DEEPER
SOIL AND FUEL LAYERS ACROSS SOUTHWESTERN PUERTO RICO, MOST
NOTABLY AROUND CABO ROJO. BREEZY ESE WINDS COMBINED WITH INCOMING
DRIER AIR MAINTAIN A MODERATE FIRE DANGER RISK TODAY, WITH
LOCALLY ELEVATED THREAT LEVELS POSSIBLE IN CABO ROJO AND
NEIGHBORING AREAS. WEATHER PATTERN UPDATES AND FUEL MOISTURE
TRENDS WILL BE MONITORED CLOSELY FOR POTENTIAL INCREASES IN FIRE
RISK.
PRZ014-082000-
SOUTHEAST COASTAL PLAINS-
330 AM AST TUE SEP 8 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 20 20 50
TEMP (24H TREND) 91 (+1) 75 (-3) 88
RH % (24H TREND) 58 (-3) 90 (0) 63
WIND 20FT/EARLY(MPH) E 18 E 14 E 18
WIND 20FT/LATE(MPH) E 18 E 13 E 18
MIXING HGT(FT-AGL/MSL)5170 5080
TRANSPORT WND (MPH) E 17 E 22
VENT RATE (KT-FT) 77550 96520
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-082000-
SOUTHERN HILLS-
330 AM AST TUE SEP 8 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 30 10 40
TEMP (24H TREND) 89 (+3) 72 (-3) 86
RH % (24H TREND) 62 (-6) 97 (+3) 67
WIND 20FT/EARLY(MPH) E 13 E 13 E 16
WIND 20FT/LATE(MPH) E 13 E 13 E 14
MIXING HGT(FT-AGL/MSL)5510 5690
TRANSPORT WND (MPH) E 16 E 21
VENT RATE (KT-FT) 77140 102420
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-082000-
NORTH COASTAL PLAINS-
330 AM AST TUE SEP 8 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 30 50
TEMP (24H TREND) 90 (0) 76 (-2) 88
RH % (24H TREND) 65 (-4) 97 (+2) 71
WIND 20FT/EARLY(MPH) E 14 E 16 E 16
WIND 20FT/LATE(MPH) E 18 E 12 E 20
MIXING HGT(FT-AGL/MSL)5270 5310
TRANSPORT WND (MPH) E 18 E 22
VENT RATE (KT-FT) 84320 100890
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-082000-
NORTHERN HILLS-
330 AM AST TUE SEP 8 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 40 10 60
TEMP (24H TREND) 89 (0) 73 (-2) 87
RH % (24H TREND) 66 (-3) 97 (0) 72
WIND 20FT/EARLY(MPH) E 12 E 14 E 13
WIND 20FT/LATE(MPH) E 16 E 10 E 19
MIXING HGT(FT-AGL/MSL)5550 6510
TRANSPORT WND (MPH) E 14 E 18
VENT RATE (KT-FT) 66600 104160
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-082000-
WEST COAST-
330 AM AST TUE SEP 8 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS NONE TSTMS
CHANCE PRECIP (%) 40 0 50
TEMP (24H TREND) 92 (0) 73 (-3) 89
RH % (24H TREND) 63 (-4) 98 (+2) 69
WIND 20FT/EARLY(MPH) E 14 E 12 E 16
WIND 20FT/LATE(MPH) E 14 E 11 E 17
MIXING HGT(FT-AGL/MSL)5180 4960
TRANSPORT WND (MPH) E 12 E 16
VENT RATE (KT-FT) 51800 69440
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-082000-
EASTERN INTERIOR-
330 AM AST TUE SEP 8 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 40 50
TEMP (24H TREND) 89 (+1) 73 (-4) 85
RH % (24H TREND) 63 (-5) 97 (+3) 71
WIND 20FT/EARLY(MPH) E 13 E 13 E 17
WIND 20FT/LATE(MPH) E 13 E 14 E 16
MIXING HGT(FT-AGL/MSL)5980 5690
TRANSPORT WND (MPH) E 17 E 21
VENT RATE (KT-FT) 89700 102420
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-082000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST TUE SEP 8 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS TSTMS TSTMS
CHANCE PRECIP (%) 50 60 60
TEMP (24H TREND) 86 (+3) 71 (-3) 82
RH % (24H TREND) 68 (-8) 100 (+2) 77
WIND 20FT/EARLY(MPH) E 12 E 11 E 16
WIND 20FT/LATE(MPH) E 12 E 11 E 14
MIXING HGT(FT-AGL/MSL)5040 4540
TRANSPORT WND (MPH) E 18 E 21
VENT RATE (KT-FT) 80640 81720
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-082000-
CENTRAL MOUNTAIN RANGE-
330 AM AST TUE SEP 8 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 40 10 50
TEMP (24H TREND) 87 (+3) 69 (-4) 85
RH % (24H TREND) 67 (-6) 98 (+1) 71
WIND 20FT/EARLY(MPH) E 10 E 9 E 11
WIND 20FT/LATE(MPH) E 10 E 9 E 11
MIXING HGT(FT-AGL/MSL)6340 7220
TRANSPORT WND (MPH) E 12 E 17
VENT RATE (KT-FT) 63400 108300
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-082000-
CAYEY MOUNTAIN RANGE-
330 AM AST TUE SEP 8 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 40 60
TEMP (24H TREND) 85 (+2) 72 (-2) 83
RH % (24H TREND) 68 (-6) 98 (0) 75
WIND 20FT/EARLY(MPH) E 10 E 11 E 13
WIND 20FT/LATE(MPH) E 11 E 10 E 13
MIXING HGT(FT-AGL/MSL)5360 4790
TRANSPORT WND (MPH) E 17 E 22
VENT RATE (KT-FT) 80400 91010
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-082000-
VIEQUES-
330 AM AST TUE SEP 8 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS TSTMS TSTMS
CHANCE PRECIP (%) 50 60 50
TEMP (24H TREND) 89 (-1) 79 (-2) 87
RH % (24H TREND) 59 (-4) 87 (+2) 65
WIND 20FT/EARLY(MPH) E 16 E 18 E 20
WIND 20FT/LATE(MPH) E 17 E 19 E 18
MIXING HGT(FT-AGL/MSL)3570 3600
TRANSPORT WND (MPH) E 22 E 22
VENT RATE (KT-FT) 67830 68400
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-082000-
CULEBRA-
330 AM AST TUE SEP 8 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS TSTMS TSTMS
CHANCE PRECIP (%) 40 60 50
TEMP (24H TREND) 90 (0) 80 (-2) 87
RH % (24H TREND) 62 (-7) 90 (+4) 69
WIND 20FT/EARLY(MPH) E 16 E 18 E 20
WIND 20FT/LATE(MPH) E 16 E 19 E 18
MIXING HGT(FT-AGL/MSL)3750 3590
TRANSPORT WND (MPH) E 22 E 22
VENT RATE (KT-FT) 71250 68210
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-082000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST TUE SEP 8 2026
TODAY TONIGHT WED
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 20
TEMP (24H TREND) 92 (+1) 75 (-3) 89
RH % (24H TREND) 57 (-1) 90 (+1) 63
WIND 20FT/EARLY(MPH) E 19 E 17 E 21
WIND 20FT/LATE(MPH) SE 20 E 16 E 23
MIXING HGT(FT-AGL/MSL)4990 4920
TRANSPORT WND (MPH) E 20 E 24
VENT RATE (KT-FT) 84830 103320
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-082000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST TUE SEP 8 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS
CHANCE PRECIP (%) 30 60 40
TEMP (24H TREND) 89 (0) 79 (-2) 86
RH % (24H TREND) 60 (-6) 91 (+4) 66
WIND 20FT/EARLY(MPH) E 18 E 18 E 20
WIND 20FT/LATE(MPH) E 17 E 20 E 19
MIXING HGT(FT-AGL/MSL)3680 3650
TRANSPORT WND (MPH) E 22 E 24
VENT RATE (KT-FT) 69920 76650
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-082000-
ST CROIX-
330 AM AST TUE SEP 8 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS
CHANCE PRECIP (%) 30 60 40
TEMP (24H TREND) 90 (0) 79 (-2) 87
RH % (24H TREND) 63 (-4) 92 (+3) 69
WIND 20FT/EARLY(MPH) E 17 E 17 E 19
WIND 20FT/LATE(MPH) E 16 E 19 E 18
MIXING HGT(FT-AGL/MSL)5050 4660
TRANSPORT WND (MPH) E 21 E 26
VENT RATE (KT-FT) 90900 107180
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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